Patent GB-720164-A (GB)
Title: Improvements in and relating to a mechanism for coupling a type composing machine with a typewriter
IPC: B41J19/64
Filed: 1950-08-17
Abstract: 720,164. Typewriters; type-bar making. OAKLEY, J. L. D. (Export Printer's Art, Inc.). Aug. 17, 1950, No. 20477/50. Classes 100 (3) and 100 (4). A typewriter 1 with equal letter-spacing is coupled to a type-composing machine in which a selector carriage of the character selection and positioning means is advanced step-bystep in consonance with the carriage of the typewriter except that it is not moved during a space-bar movement of the typewriter carriage; the carriages of both the typewriter and the type-composing machine are returned to their initial positions at the end of each line of type. The typewriter 1 effects, by mechanism not shown, printing on a paper carried on a platen carriage and the key-levers 3, Fig. 4, are coupled to the composing machine, described in Specification 719,933, by a series of plungers 12 sliding vertically in a combplate 11 and linked to auxiliary key-bars 13, which pivot about studs 20, and which have an upwardly directed nose-piece 27 engaging a channel member 28 also pivoted about the stud 20. The amount of pivoting of the channel member 28 is dependent upon the width of the character selected and for each individual key-bar 13 a particular degree of pivoting is effected according to the horizontal adjustment of its stud 20 which is mounted on a plate 17 slidingly mounted in a comb 14. The plate 17 is adjusted by the head 25 of a screw 18 threaded into a sleeve 22 non-rotatably slidable in framework cross-member 19. The difference in letter-spacing required between lower-case and capital characters is arranged, upon operation of a shift key, by movement of the sleeve 22 in the cross-member 19, effected by a bell-crank 53, engaging in an annular groove 22a of the sleeve, and which is operated by an adjustable screw 52 in a channel 54 attached to a lever 51 at each side of the machine. The levers 51 are formed with slots 50 for engagement by rollers 49, which are carried by levers rotated by shafts 47, levers 45 and links 46 from levers 44 having rollers 43 engageable by the shift keys 5. The channel member 28 slidingly carries a driving block 31, Fig. 3, transmitting the differential movements to a diagonal slide arm 32a of a framework 32 slidable on rods 37 by the action of the driving block 31 against the even pull of two weights 42, Fig. 1, through cord and pulley connections 39, 40. As the framework 32 advances (upwardly, Fig. 3), the driving block 31 moves to the right under the pull of band 231 drawn by a spring in a housing 232. The amount of advancement of the framework 32 and the corresponding approach to the end of a line of type in the composing machine is transmitted to an indicator above the typewriter keyboard by a second diagonal arm 33 permitting a plate 34 to move a bar 35 slidably mounted in a frame 10 under influence of a tensioning member 36. Attached to each extremity of the bar 35 is a cable 100, passing through guides 102, Figs. 1 and 2, over pulleys 101, and which carries a pointer 99 passing over a scale 98. The pointer carries a magnet 107 so that when it approaches a predetermined line end it causes the operation of a small switch 105 and stops the machine. Switch 105 is movable along a pair of insulated conductor rails, into the required position usually indicated by a finger 209. The typewriter carriage carries a hinge plate 73, Fig. 1, carrying at the free edge a rack 75 meshing with a pinion 76 on a shaft 77 so that typewriter carriage movements are automatically transmitted through the shaft 77 to a second pinion 78 driving a rack 79 and the selector carriage of the character selection and positioning means of the type-composing machine. The rack 79 and the selecter carriage however are not advanced when a space-bar 6 is operated, since such operation disconnects the rack 75 from the pinion 76 by means of a bar 72 connected between two levers 71 operated by linkage 69, 66, 65, 64 from a lever 60-63 having a roller 59 positioned below the spacebar 6. The rack 79 thus is lagging behind the typewriter carriage at the end of a line but is brought into register by the carriage-return movement, whereupon the tail of the rack 79 is first restored to the initial position when it contacts an abutment 82, Fig. 18, on a lever 83. Lever 83 is thus moved clockwise, and a cam surface 88 engages a roller 89 on a latch 90 which is thereby lifted and a lower hooked end 93 thereof engages one of the levers 71 carrying the bar 72 which disengages the rack 75 from the pinion 76. With rack 75 disconnected from pinion 76 the typewriter carriage travels to its initial position in alignment with the rack 79, and in this position a stop 95 engages an adjustable abutment 96 on the latch 90 to release the rack 75 for reengagement with the pinion 76.